Input and output devices of a computer

Element | description | picture |
Keyboard | In computing, a keyboard is a typewriter-style keyboard, which uses an arrangement of buttons or keys, to act as mechanical levers or electronicswitches. Following the decline of punch cards and paper tape, interaction via teleprinter-style keyboards became the maininput device for computers. | |
Code bar | A barcode is anoptical machine-readable representation of data relating to the object to which it is attached. Originally barcodes represented data by varying the widths and spacings of parallel lines, | |
Reader | Help reduce eyestrain, blurred vision and other problems
triggered by daily use of computer monitors. | |
Scanner | A scanner allows you to capture documents that are printed on paper and turns them into digital oronline format so you can see it on your computer | |
Mouse | A mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouseconsists of an object held under one of the user's hands, with one or more buttons. | |
Webcam | A webcam is a video camera that feeds its images in real time to a computer or computer network,often via USB, ethernet, or Wi-Fi. | |
Microphone | A microphone  is an acoustic-to-electric transducer or sensor that convertssound into an electrical signal. Microphones are used in many applicationssuch as telephones, tape recorders, karaoke systems, hearing aids,motion picture production, live and recorded audio engineering, FRS radios, megaphones, in radio and television broadcasting and incomputers for recording voice, speech recognition, VoIP, and for non-acoustic purposes such as ultrasonic checking or knock sensors. | |
Cell phone | A mobile phone is a device that can make andreceive telephone calls over a radio link whilst moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public...